Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b67d2f8143a82c203d05edb9dce239ee25ae4421cf893d45cd3331d7d73ab7' 
  AND token = 'fATr/+I1wMM3mYd5qEmWY3kzuHHiEBYUrsW3lvt/uGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}